Partridge cochin heavy

These are my friend's partridge cochin heavy chickens. He's crossing the Male (Partridge male, names Jumbo) with Golden buff (females) and Black buff (females). I wanted to know how the chicks will look like? Would they be Full partridge? OR will they be a cross of golden/black heavy with partridge?
And the 2nd question comes in my mind every time, Is this really a Partridge cochin? Partridge cochin which I've seen in #google have more of a blue color on their chest.. :\ Anyone HELP..